Exactly. That's why setting tiller dead even is a starting point. The key is how the individual grips the bow, because moving the center of pressure up and down the bow's grip makes the limbs react differently. My grip puts more pressure in the throat of the grip, which puts more load on the top limb. The next guy might put more pressure on the heel of the grip, loading up the bottom limb more. And someone else might have their grip pressure evenly distributed across the center of the grip, which would put more even pressure on both limbs.

With stickbows, you have to sand the limbs to get tiller fine tuned for your grip. Or live with nocksets that are ridiculously high or low. Compounds are so-o-o-oo easy. Just tweak a bolt here and another there. Too bad so many people aren't aware of how much tiller can affect their shooting, and how easy it is to turn many bows they think are lemons into real shooters.